Stent coating device

Coating method for selectively applying a coating to surfaces of an object, wherein the object is a catheter (4), that includes a balloon portion on which a stent (2) is provided, applying the method the coating based in optical properties of the surfaces so that the coating is applied to the surfaces of the stent (2) and not applied to the surfaces of the balloon portion, with the surfaces of the optically distinguishable stent surfaces of balloon catheter (4), the coating method comprising: (a) generating a relative movement between the object and at least one optical scanning device (32a, 32b) and at least one coating applicator (30a, 30b, 30c) ; (B) optically scanning a portion of the object using said at least one optical scanning device (32a, 32b) to produce an output indicative of the different types of surfaces of the stent (2) and balloon portion of the catheter ( 4); and characterized by (c) responding to said output by selectively activating said coating applicator (30a, 30b, 30c), thereby applying the coating only to surfaces of the stent (2).